PHP获取上级（来路）URL相关信息

1、获取当前的域名:

$_SERVER['SERVER_NAME'];

$_SERVER["HTTP_REFERER"];

$_SERVER['REQUEST_URI'];

$_SERVER['HTTP_HOST'];

dirname(__FILE__);

dirname(__FILE__)."/../";

$_SERVER['PHP_SELF'];

$_SERVER["HTTP_HOST"].$_SERVER["PHP_SELF"]."?".$_SERVER["QUERY_STRING"]; 

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